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b in (-oo:+oo)
(-1/2)*b-(1/4) = -17/36 // + -17/36
(-1/2)*b-(1/4)-(-17/36) = 0
(-1/2)*b-1/4+17/36 = 0
2/9-1/2*b = 0 // - 2/9
-1/2*b = -2/9 // : -1/2
b = -2/9/(-1/2)
b = 4/9
b = 4/9
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